Ozone near the earth's surface (which this road surface attacks) is a health risk, and contributes to smog. Ozone higher up in the atmosphere (of the famous "h

Ozone near the earth's surface (which this road surface attacks) is a health risk, and contributes to smog. Ozone higher up in the atmosphere (of the famous "hole") blocks UV radiation. http://www.policyalmanac.org/environment/archive/ozone.shtml http://www.policyalmanac.org/environment/archive/ozone.shtml